Crest Audio LH1 LOUDSPEAKER Specifications

S E R I E S Features Description • Smooth frequency response characteristics • 600 Watt continuous rated woofer • 150 Watt continuous rated compression driver • 90 degree x 40 degree constant directivity horn with 2" throat • High power crossover components • Neutrik Speakon® input connectors, with automatic biamp switching • 15 degree trapezoidal cabinet design • Recessed steel handles with comfortable round handgrip • Heavy gauge metal grill with black, powder-coat finish • High-impact resistant polypropylene cabinet corners • Rugged stand adapter • Exterior grade 3/4" 7-ply all poplar APA-1 plywood • Scuff and weather resistant, black Hammer-Head™finish The Crest Audio LHTM1 is a two-way speaker system comprised of one 15" high power woofer, one 2" exit compression driver coupled to a 90° x 40° con- stant directivity horn. As with all LHTM full-range speakers, this unit can be driven in full-range or biamp mode simply by plugging into the desired jack on the input plate.The LHTM1 has a trapezoidal shaped cabinet, rather than the more traditional rec- tangular shape.This allows cabinet arrays to be constructed more easily.This shape also reduces the build-up of internal standing waves. Standing waves are internal amplitude peaks that occur due to reflections within the cabinet at frequencies related to the internal square dimensions of the cabinet.The trapezoidal shape resists the formation of standing waves by causing the internal reflections to cancel rather than reinforce each other.This ensures a minimum of mid-bass and mid-range coloration. Crest Audio’s protection circuit for mid and high frequency driver protection is included as a standard feature.The input signal is routed through the protec- tion circuit in both full-range and bi-amp modes of operation.When high fre- quency drive level to the LHTM1 exceeds predetermined thresholds, the pro- tection circuit is temporarily engaged. This subtly decreases the signal level applied to the high frequency driver so that it will not be damaged due to long- term overpowering. Large amplitude, short duration transients will not be attenuated by the protection circuit and thus have the potential to damage the driver.The protection circuit is realized through the use of a dynamically resis- tive component in conjunction with a switched padding circuit. An additional feature in the crossover circuitry is a mid-range contour switch. This switch allows a choice between flat (HIGH position) and mildly attenuat- ed (NORMAL position) mid-range frequencies. The position of this switch is purely dependent on venue and personal sonic taste. As a suggestion, the NORMAL position is more suitable for live (highly reflective, long reverb time) venues. Whereas, the HIGH position is more suitable in venues where the reverb time is relatively short.This switch is located on the rear panel input plate and is actuated with a suitable tool such as a flat screwdriver tip, or door key. LH TM1 Loudspeaker LHTM1 LHTM2 LHTM3 LHTM4 LHTM5M LHTM6M LHTM7M 600W 1,000W 500W 1,200W 400W 500W 1,000W 1,200W 2,000W 1,000W 2,400W 800W 1,000W 2,000W 2,400W 4,000W 2,000W 4,800W 1,600W 2,000W 4,000W Power Handling Continuous Program Peak

power handling ratings. Crest Audio rates this unit’s system power handling using a modified form of the AES Standard 2- 1984. Utilizing audio band limited (20 Hz - 20 kHz) pink noise with peaks over four times the RMS level, this strenuous test signal assures the user that every portion of this system can withstand high inpact music. The test signal contains large amounts of very low frequency energy, effectively simulating the frequency con- tent of live music situations. High frequen- cy test signals expose the speaker system to synthesized tones that may extend beyond audibility. This rating is contingent on having a minimum of 3 dB of amplifier headroom available so as to ensure that clipping does not occur. Frequency Response This measurement is useful in determin- ing how accurately a given unit repro- duces an input signal. The frequency response of the LH1 (Figure 1) is meas- ured at a distance of 1 meter using a 1 Watt (into the nominal impedance) swept- sine input signal. Directivity Beamwidth is derived from the -6 dB points from the polar plots which are measured in a whole space anechoic environment. Q and Directivity Index (Figures 3 & 4) are plotted for the on-axis measurement position. These are specifi- cations that provide a reference to the coverage characteristics of the unit.These parameters provide insight for proper placement and installation in the chosen environment. 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) 1 10 100 Q & Directivity Index Q Figure 4 20 10 Di 0 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) 30 40 60 80 100 140 180 300 360 Beamwidth (Degrees) Beamwidth Vertical Horizontal Figure 3 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) 1 2 3 5 10 20 30 50 100 Impedance Z ( ) Figure 2 Lower Curve: Midrange Contour = High, Upper Curve: Midrange Contour = Norm 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) 70 80 90 100 110 dB SPL (re 20 Pa) Amplitude Response (1W 1m On-Axis) Figure 1 Lower Curve: Midrange Contour = Norm, Upper Curve: Midrange Contour = High

Specifications LH TM1 Loudspeaker Horizontal Polars Vertical Polars -90 o -60 o -30 o 0 o 30 o 60 o 90 o 125 Hertz -90 o -60 o -30 o 0 o 30 o 60 o 90 o 250 Hertz -90 o -60 o -30 o 0 o 30 o 60 o 90 o 500 Hertz -90 o -60 o -30 o 0 o 30 o 60 o 90 o 1000 Hertz -90 o -60 o -30 o 0 o 30 o 60 o 90 o 2000 Hertz -90 o -60 o -30 o 0 o 30 o 60 o 90 o 4000 Hertz -90 o -60 o -30 o 0 o 30 o 60 o 90 o 8000 Hertz -90 o -60 o -30 o 0 o 30 o 60 o 90 o 16000 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 125 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 250 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 500 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 1000 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 2000 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 4000 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 8000 Hertz 0 o 30 o 60 o 90 o -30 o -60 o -90 o 16000 Hertz

power handling sound pressure level maximum sound pressure level (1 meter) radiation angle measured transducer complement box tuning frequency crossover frequency (internal passive) recommended minimum active crossover time offset impedance Z input connections enclosure materials and finish dimensions (H x W x D) net weight LHTM1 Loudspeaker 48 Hz to 20 kHz ±3 dB 35 Hz Full Range 600 W - 69.3 V RMS 1,200 W program 2,400 W peak passive high freq 150 W - 34.6 V RMS 300 W program 600 W peak Full Range 97.0 dB SPL, (2.83 V input) high freq107 dB SPL, (2.83 V input) Full Range 126.8 dB SPL continuous 132.8 dB SPL peak High Freq 134.5 dB SPL continuous 140.5 dB SPL peak 90 degrees horizontal x 40 degrees vertical Low Freq 1x 15" Woofer, vented basket High Freq 2.0" Exit / 75 mm voice coil compression driver on a CD horn Fbox 44 Hz Low Freq High Freq - 1600 Hz Low Freq High Freq - 1600 Hz Low Freq 0.00 ms High Freq 0.60 ms Full Range Nominal 8.0Ω Minimum - 6.9Ω High Freq Nominal 8.0Ω Minimum - 8.2Ω 2x Neutrik Speakon 4 conductor input jacks 1x Neutrik Speakon 4 conductor biamp switching input jack 3/4" 7-ply premium, exterior grade, all-poplar, void-free plywood. Material conforms to APA-1 specification. Finished in black, Hammer-Head poly-coating. front 33.50" x 22.38" x 19.75" 851 mm x 568 mm x 502 mm rear 33.50" x 12.75" x 19.75" 851 mm x 324 mm x 502 mm 106 Lbs.(48.2 kg) Crest Audio Inc. 16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA TEL: 201.909.8700 FAX: 201.909.8744 www.crestaudio.com *80304806* Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications. 8/21/01 v.1.5 Architects’ & Engineers’ Specifications: The loudspeaker system shall have an operat- ing bandwidth of 48 Hz to 20 kHz. The nominal output level shall be 97.0 dB when measured at a distance of one meter with an input of one Watt. The nominal impedance shall be 8.0 Ohms. The maximum continuous power han- dling shall be 600 Watts, maximum program power of 1,200 Watts and a peak power input of at least 2,400 Watts, with a minimum ampli- fier headroom of 3 dB. The nominal radiation geometry shall be 90 degrees in the horizontal plane and 40 degrees in the vertical plane. The outside dimensions shall be 33.50 inches high by 22.38 inches wide by 19.75 inches deep. The weight shall be 106 pounds. The loudspeaker system shall be a Crest Audio model LHTM1.